Halves

How to play

1. Tap an empty cell for a circle, again for a square, again to clear.
2. Each row and column has as many circles as squares.
3. Never three identical shapes in a row or column.
4. Grey cells are given and cannot change.

About

Fill the grid with circles and squares. Every row and column is split exactly in half, and no three of the same shape may sit side by side. One solution, a new grid every day.